21379011 has 8 divisors (see below), whose sum is σ = 28582080. Its totient is φ = 14214312.

The previous prime is 21378997. The next prime is 21379019. The reversal of 21379011 is 11097312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21379011 - 2⁷ = 21378883 is a prime.

It is a super-2 number, since 2×21379011² = 914124222676242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21379019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8265 + ... + 10538.

It is an arithmetic number, because the mean of its divisors is an integer number (3572760).

Almost surely, 2^21379011 is an apocalyptic number.

21379011 is a deficient number, since it is larger than the sum of its proper divisors (7203069).

21379011 is a wasteful number, since it uses less digits than its factorization.

21379011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19185.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 21379011 is about 4623.7442619591. The cubic root of 21379011 is about 277.5423131647.

The spelling of 21379011 in words is "twenty-one million, three hundred seventy-nine thousand, eleven".